Dentifrice



Patented Dec. 11, 1923.

UNITED STATES PATENT OFFICE.

RUDOLPH A. KUEVER, OF IOWA CITY, IOWA, ASSIGNOR TO PEISODENT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

nnu'rrrnrcn.

1T0 Drawing.

To all whom it may concern:

Be it known that I, RUDOLPH A. KUE ER, a citizen of the United States, and a resident of Iowa City,

5 State of Iowa, have invented certain new 'and useful Improvements in Dentifrice, of

which the following is a specification.

This invention relates to dentifrices' and has among its objects to produce a denti- 1 frice having an advantageous abrasive action.

While the abrasive ingredient of a dentifrice is of primaryimportance; the production of an abraslve ingredient capable of effectively performing its intended function without 1n ury to the teeth and which will not interfere with beneficial reactions produced by other ingredients of the dentifrice in the mouth is a matter of considerable dif- I have discovered that in abrasive action, sults of an kind may be obtained by mixing dihydrated calcium sulphate with many of the abrasives now employed in dentifrices.

This-material is inert t0 the chemical reactions which may take place'in the mouth, may be incorporated in almost any dentifrice without effect therein exceptas a diluent. It is an excellent abrasive inasmuch as it 'comes in the form of minute crystals, which maybe comminuted as finely as desired, but nevertheless will retain an efficient abrasive action, is softer than the teeth and therefore incapable of injury thereto. Its use in combination with other known abrasives produces most satisfactory results, while at a marked efliciency in the county of Johnson and without deleterious rethe same time it does not Application filed April 5, 1920. Serial No. 371,499.

interfere with the beneficial reactions or functions of the ingredients of a dentifrice in which it may be included.

As a specific illustration of the use of the substance I select a known proteolytic dentifrice, including a proteolytic enzyme, such as pepsin andan acid in combination with an abrasive. In such a dentifrice I may use a liberal portion of the proposed abrasive.

- A preferred formula 'is. as follows :Ipepsin,

0.81%; acid calcium phosphate (Ca P0,), 1.04% calcium chloride, 0.44%; tri-calcium phosphate, 36.39%; dihydrated calcium sulphate, 15.60%; glycerin, alcohol, water, 45.72%.

The dihydrated calcium sulphate forms, with tri-calcium phosphate, an exceedingly efiicient abrasive mixture, while the various reactions which follow the use. of thti denti-' containin a roteol tic enz me in addition g P g y d to the ingredlents t erein specified.

'In witness whereof, I hereunto subscribe my name this 29th day of March, A. D 1920. I

Q i R. A. KUEYER, 

